Google Sites allows you to easily create a free website. This page contains several examples of teachers' classroom Google Sites.
This video introduces you to Google Sites
This video shows you how Google Sites can be integrated with other other Google Apps to transform learning
Basic Set-Up Tutorials
Sidebar (Menu Bar) Tutorials
Adding and Embedding Content
Fixing Double Navigation on the Sidebar (added 9/16/2013)
Editing a Menu Bar Item (use this for IPT 334/444!)
Adjusting the Width of the Sidebar
Creating & Editing a Horizontal Navigation Bar
Editing a Navigation Sidebar (Menu Bar) Item
Creating and Editing Sidebar Items
Here's an additional tutorial if you have subpages that are not showing up in the sidebar (hint: it might be because the sidebar only shows two levels of pages in the hierarchy by default.)
Inserting an image from your computer
Inserting an image using a url
Inserting Picasa Photos and Slideshows
Adding a Comment Box (new-Pnyxe)
Embedding a Calendar from Gradebook
Embedding media using embed codes
Embedding media using an embed gadget
Creating a contact form using Google Forms
Inserting a Disqus comment box
Alternative: This alternative uses a script instead of the Google Form's notification rules to email you. Your email will then contain the actual message submitted instead of a generic "User Submitted Form" email.